Hello!
I implement a boost bimap as fallowing:
boost::bimap< boost::bimaps::multiset_of , boost::bimaps::set_of  > myMap
Now I have ‘right iterator’ (myMap::right_iterator rIt) to specific element
 that I need to convert to related ‘left iterator’ so I can iterate from
 this point on left side (mean get ‘left iterator’ on rIt->second),
how I implement it? 
 
Thanks.